in English is:

deontology

Mutations

Soft:ddeontoleg
Nasal:neontoleg
Aspirate:(no mutation)

Use

y ddeontoleg hon
fy neontoleg i
dy ddeontoleg di
ei ddeontoleg ef/o
ei deontoleg hi
ein deontoleg ni
eich deontoleg chi
eu deontoleg nhw/hwy
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